By analyzing wind farm harmonic model, the harmonica contents can be calculated by the software and differing means of reducing the harmonic contents can be found depending on the feature of the harmonic source; moreover, the origin could be traced by harmonic frequency spectrum when problems occurring in the system.

Power systems designed to function at 60 Hz in the United States and 50 Hz in many other countries may experience unsatisfactory operation and, in some instances, failure when subjected to voltages and currents that contain substantial harmonic frequency elements.

Interestingly, the mosquitoes adjust the harmonic resonance of their thoracic box to produce a harmonic frequency that converges at a frequency that is the female's third harmonic (three times her fundamental frequency) and the male's second harmonic (two times his fundamental frequency).

such as in power amplifiers stimulated with a narrowband input signal, there is only one dominant large-signal input component present, whereas all other input components (the harmonic frequency components) are relatively small.

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